Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a30860ce3aef7e0bc4236f798048c96a69160df3bc2f28a0ee4f608b68039d9b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^